CVE-2021-3750
Publication date 2 May 2022
Last updated 24 July 2024
Ubuntu priority
A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| qemu | ||
| 22.04 LTS jammy |
Fixed 1:6.2+dfsg-2ubuntu6.6
|
|
| 20.04 LTS focal |
Fixed 1:4.2-3ubuntu6.24
|
|
| 18.04 LTS bionic |
Fixed 1:2.11+dfsg-1ubuntu7.41
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
Notes
Patch details
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.2 · High
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | High |
| User interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-5772-1
- QEMU vulnerabilities
- 12 December 2022